Sewing machine



Mar. 27, 1923. 1,449,682. E. A. LEE.

SEWING MACHINE. FILED APH. I4, 192| 2 SHEETS-SHEET l.

j l /9 grim w @V Emil@ lng Patented Mar. 27, 1923.

ERNEST A.. LEE, F LORAIN, OHIO.

SEWING MACHINE.

Application filed April 14, 1921.

. To all 'whom t may concern.'

Be it known that i, ERNEST Lnn, a

citizen of the United' States, and resident of Lorain, in the county ofLorain and State 0f hio, have invented certain new and usefulimprovements in Sewing Machines, of which the following is aspeciiication.

. This invention relates to sewing machines and more particularly tosewing machines for closing bags in which the bags are carried along themachine by an endless conveyer. A

The principal object of this invention is to provide a sewing machine ofthisclass having a conveyer for transferring the bags to be closed pastthe sewing head in either direction.

Another object is to provide a machine of this class having a conveyerfor handling the bags to be closed, in transferring them past the sewinghead, and having means for running the sewing head when the conveyer isOperated in one direction only.

Figure 1 is a front side elevation of a sewing machine, having myinvention applied thereto.

Figure 2 is an enlarged detail of the clutch mechanism for controllingthe operation-of the sewing head.

1Eigure 3 is a wiring diagram showing the control circuits to theoperating motor of the machine.

Referring particularly to the drawings, 2 designates the supportingframe of the machine having a sewing head 8 supported thereon. Thread isfed to the sewing head 3 fromy suitable bobbins 4 supported on bracket 5mounted to the rear of the sewl ing head.

A suitable endless conveyer 6, for conveying bags to be sewed, ismounted to travel over suitable rollers 7 and 7 journaled on shafts 8and 8", respectively, projecting forwardly from the supporting frame 2.A roller support is mounted under the upper face of the conveyer 6 toprevent the conveyer sagging when the heavy bags are carried thereon,and comprises a frame 9 supported on brackets 10 and having rollers 11journaled therein.

A reversing motor 12 is mounted beneath the frame 2 and is connected bya sprocket drive chain 12 to the roller 7 so as to drive the conveyer 6.A jack shaft 13 is journaled 'in the frame 2 and is geared to the SerialNo. 61,206,

motor 12. A pulley 14 is mounted loosely on the shaft 13 and isconnected by a belt 15 with the operating pulley 16 on the sev'- inghead 3.

@ne member 17 of a toothed clutch is secured to the upper face of thepulley 14 and is adapted to be engaged by a cooper ating clutch member18, having co-operating teeth and slidably mounted on the shaft 13. Theclutch members 17 and 1S have ratchetlilre teeth 19 on their engagingfaces. That is, teeth that wil,I hold in one direction of rotation oniyand are so arranged that they wi hold only when the motor is operatingin the forward direction, that is in the direction necessary to move theco veyer from right to left in the direction of arrow X. it will,therefore, be apparent that since the saine motor drives both theconveyer 6 and jack shaft 18 the sewing head will operate only when theconveyer is operating in one (forward) direction.

A clutch lever 2O is pivotally supported on a standard -i1 secured tothe sewing head 3 and is connected to the clutch member 18. A coilspring 22 has its` one end secured to the sewing head 3 and its otherend secured to the lever 2O so to normally pull the lever 2O and clutchmember 18 downwardly so that member 13 will be engaged with the clutchmember 17 on the pulley 1a.

Vfhen the motor 12 is reversed the operator may pull down on the lever2O to disengage the clutch members 17 and 18 and thus prevent wear ofthe toothed faces, but whether the clutch members are disengaged or notthe sewing head will not operate when the motor is reversed, asexplained above.

rEhe motor 12 is adapted to be controiled by a foot or treadle switch24: having in* sulated contacts 25 and 26 on eachrend, which contactsare in circuit with magnetic switches 2T and 28. respectively, each ofwhich has one up and one down contact. A resistance 29 included in themotor circuit and a magnetic switch 81 is included in the circuit withthe switches 27 and 28 and is adapted to cut out the resistance when themotor is running in the forward direction'.

When the switch 24 is rocked to close contact 25 the circuit is closedfrom plus line through wire 32, contact 25, wire 33, through magnet coilof switch 27 through wires 34rand 47 to minus line, thus operatingswitch 27 closing the upper contact and opening the lower contact.

The shunt `field 35 of motor 12 is connected across the linecontinuously by wires 36 and 37. The operation of the switch 27 closesthe armature circuit to motor 12, as follows z-From plus line throughwire 38 to top of switch 27 to wire 39 througharma-r ture A of motor 12,to wire 46, to switch 28,

through the bottom contact of switch 28v ythe motor 12 forward or in thedirection i wire 43 to minus line.

necessary to operate both the conveyer and sewing head to close bags.

After a bag has been passed under the sewing` head and it is desired forany reason to re-sew it, as for instance when one bag is enclosed withinanother and each bag is sewed separately, the operator will depress theopposite side of switch 24,. clos ing contact 26 to reverse the motor12.

.The closing of` contact 26 will make a circuit from the plus linethrough wire 32, 'contact 26, wire 46, through magnet coil of switch 28andwire 47 to minus line, thus opening bottom contact of switch 28, andclosing the armature. circuit to motor in reverse direction from theplus line through vwire 38, top contact of switch 28, wire 40,

through armature and wire 39 to the bottom contact of switch 27 tiroughwire 49 and through section C of the resistance 29, through wire 42,coil S of switch 25, through l/Vhen the control switch 24 is in neutralposition with contacts 25 and 26 both open `and armature A of the motor12 is still revolving, dynamic braking for quickly bringing the armatureto rest is obtained. The shunt field is constantly connected across theline as described above, and the armature is short circuited as follows-The bottom contactof switches 27 and 28 are.

`of resistance 29, through wire 49 to bottom Contact of switch 27, thenthrough wire 39 and the opposite side of the armature A to startingpoint.

The operation of this improved sewing v machine is as follows Theoperator rocks are used, it is desired to again sew the bag the operatorwill raise the lever 2O to disengage the clutch member 18 from themember 17, and rock the switch 24 to close contact 26 thus reversing thecircuit to the motor 12 and causing the motor to operate in the reversedirection, therefore operating the conveyer in the reverse direction,that is, in the direction of arrow Y, and carry the bag back to thestarting point.

lt will of course .be understood that, due to the clutch members 17 and18 beingdisengaged, the sewing head` remains inoperative during thereverse operation of the motor 12, although if the clutch members werenot disengaged they would not operate the sewing head, due tothe ratchetfaces, which are of ratchet tooth construction and are free to ride oneach other inthe reverse past the head, means for operating said con?"veyer in opposite directions, and meansfor automatically rendering saidsewing head inoperative when said conveyer is operated V1n -onedirection. Y

`2. A bag sewing machine comprising, ak sewing head, a conveyer formoving the bag,

past the head, means for operating said conveyer in forward and reversedirections, said means including a reversing `motor having a drivingconnection with said conveyer, and means forreversing said motor, a,jack shaft gearedto said motor and adapted to drive said sewing head,and a clutch for connectingvsaid sewing head with saidsha'ft, saidclutch being operative only when motoi1 is operating in a` forwarddirection.

ln testimony whereof, I have hereunto signed my/name.

, ERNEST A. LEE.

